models and doc update

doc/invitation/sq_invitation.puml

@@ -0,0 +1,7 @@
+@startuml Server Invitation Step 01
+Bob -> MeowBob: Create invitation for alice (Generate Bob ContactCard and create Alice pending contact)
+Bob -> Alice: Send invitation (Bob ContactCard)
+Alice -> MeowAlice: Accept Invitation and create answer (Generate Alice ContactCard and create finalized Bob contact)
+Alice -> Bob: Send answer (Alice ContactCard)
+Bob -> MeowBob: Review Answer, invitation finalize (Finalize Alice contact and notify Alice that communication is possible)
+@enduml 

doc/invitation/sq_srvinv01.puml

@@ -0,0 +1,12 @@
+@startuml Server Invitation Step 01
+User -> Bastet : fill invitation
+User -> Bastet : select servers
+Bastet -> NativeLib : get server cards for selected uids
+NativeLib -> Bastet : server cards
+Bastet -> NativeLib : invitationCreateMessage
+NativeLib -> Bastet : invitationMessage
+Bastet -> Server : send invitation
+Server -> Redis : Store invitation
+Server -> Bastet : invitation URL
+Bastet -> User : invitation URL
+@enduml 

doc/invitation/sq_srvinv02.puml

@@ -0,0 +1,11 @@
+@startuml Server Invitation Step 02
+User -> Bastet : paste URL
+Bastet -> NativeLib : build invitationGetMessage
+NativeLib -> Bastet : invitationGetMessage
+Bastet -> Server : send invitationGetMessage
+Redis -> Server : retrieve invitation
+Server -> Bastet : invitation message
+Bastet -> NativeLib : decode invitation message
+NativeLib -> Bastet : invitation data
+Bastet -> User : invitation data
+@enduml 

doc/invitation/sq_srvinv03.puml

@@ -0,0 +1,12 @@
+
+@startuml Server Invitation Step 03
+User -> Bastet : select servers
+User -> Bastet : accept invitation
+Bastet -> NativeLib : accept invitation
+Bastet -> NativeLib : build accept message
+NativeLib -> Bastet : invitationGetMessage
+Bastet -> Server : send accept message
+Server -> Redis : store accept message
+Server -> Bastet : accept message ok
+Bastet -> User : accept msg sent
+@enduml 

doc/invitation/sq_srvinv04.puml

@@ -0,0 +1,9 @@
+
+@startuml Server Invitation Step 03
+Bastet -> NativeLib : periodic message check
+NativeLib -> Server : get new messages
+Server -> NativeLib : send invitation message
+Server -> Redis : store accept message
+Server -> Bastet : accept message ok
+Bastet -> User : invitation sent is accepted
+@enduml